It could be either, depending on what x equals.
If x = 9, 8 will solve the first one.
If x = 1, 8 will solve the second one.
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87.5 = (8 x 10) + (7 x 1) + (5/10)
(2 x 3 x 4 x 5 x 6 x 7 x 8 x 9) + 1 will have a remainder of 1 when divided by 2, 3, 4, 5, 6, 7, 8, or 9. (2 x 3 x 4 x 5 x 6 x 7 x 8 x 9) + 1 = 362,881
8.478 = (8 x 1) + (4/10) + (7/100) + (8/1000).
Expanded Notation of 8,759 = (8 x 1,000) + (7 x 100) + (5 x 10) + (9 x 1)
x2 - 7x = 8 x2 - 7x - 8 = 0Now find two numbers that multiply to equal -8, and add to equal -7.(1) * (-8) = -8(1) + (-8) = -7(x+1)(x-8) = 0 This is the factored form of x2 - 7x = 8You can then solve the equation if necessary, and get:x = -1 or x = +8